"Then I received a phone call from someone 'very very in' with the SUPERMAN LIVES project, who said that Kevin Spacey and Chris Rock are now signed on to the project as Braniac and Jimmy Olsen respectively"
http://legacy.aintitcool.com/node/639
IndieWire 7/24/14
"Before shutting down, Burton’s film boasted the likes of Chris Rock (as Jimmy Olsen)"
https://www.indiewire.com/2014/07/watch-trailer-for-the-death-of-superman-lives-about-tim-burtons-aborted-man-of-steel-movie-274145/
CinemaBlend 10/31/14
"In addition to Nic Cage, Dan Gilroy says that they had Chris Rock on hand to play Jimmy Olsen."
https://www.cinemablend.com/new/Craziest-Thing-About-Tim-Burton-Canceled-Superman-Project-67989.html